A phase lock oscillator usually abbreviated as PLO is a feedback control circuit. The output signal of this oscillator is phaselocked to a reference signalMostlya crystal oscillator is the reference frequency.
A PLO is comprised of three fundamental blocks-
- Phase Detector
- Loop Filter
- Voltage Control Oscillator
Phase Lock Oscillators are available as:
- PLXO – 10 to 1400 MHz
- PLVCO – 10 MHz to 32 GHz
- PLDRO – 5 to 42 GHz
- PLCRO – 0.5 to 4 GHz
PLO are uses depend upon the specific array of requirement such as-
- Requirements of internal and external reference frequency
- Output frequency
- Power output
- Environmental necessities
- Spectral qualities such as harmonics, phase noise etc